45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
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/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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DEF_SIMPLE_GM(PlusMergesAA, canvas, 256, 256) {
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SkPaint p;
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p.setColor(SK_ColorRED);
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p.setAntiAlias(true); // <-- crucial to the test that we use AA
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// Draw a two red squares.
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canvas->drawRect(SkRect::MakeWH(100, 100), p);
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canvas->drawRect(SkRect::MakeXYWH(150, 0, 100, 100), p);
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p.setColor(0xf000ff00);
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// We'll draw a green square on top of each using two triangles.
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SkPath upperLeft;
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upperLeft.lineTo(100, 0);
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upperLeft.lineTo(0, 100);
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upperLeft.lineTo(0, 0);
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SkPath bottomRight;
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bottomRight.moveTo(100, 0);
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bottomRight.lineTo(100, 100);
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bottomRight.lineTo(0, 100);
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bottomRight.lineTo(100, 0);
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// The left square is drawn simply with SrcOver. It will show a red seam.
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canvas->drawPath(upperLeft, p);
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canvas->drawPath(bottomRight, p);
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// Using Plus on the right should merge the AA of seam together completely covering the red.
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canvas->saveLayer(nullptr, nullptr);
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p.setXfermodeMode(SkXfermode::kPlus_Mode);
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canvas->translate(150, 0);
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canvas->drawPath(upperLeft, p);
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canvas->drawPath(bottomRight, p);
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canvas->restore();
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}
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